//定义一个类Box
class Box
{
    // Declare private members
private:
    int _len;
    int _w;
    int _h;
    int _s;
    int _v;
    // Declare member functions
public:
    bool set_len(int len);
    bool set_w(int w);
    bool set_h(int h);

    int get_len();
    int get_w();
    int get_h();

    int get_s();
    int get_v();

};